N4

のは

Nominalizer pattern used to emphasize what comes before it

ドアどあ
閉めるしめる
まで
聞こえきこえ
Just before the door closed, what I heard coming toward me was…
そう
思っおもっ
わたくし
だけ
なかっ
らしい
It seems I wasn't the only one who thought that way.
まぁ
おとこ
って
見栄みえ
張りはり
たがる
種族しゅぞく
から
Well, men are the type of species that wants to show off.
こころ
なか
叫んさけん
太陽たいよー
沈んしずん
から
だっ
It was after the sun had set that I/they shouted in my/their heart.
嬉しうれし
そう
見えるみえる
せい
ない
だろう
It's probably not just my imagination that they seem happy.
流石さすが
そこ
まで
もらう
申し訳もーしわけ
ない
I feel bad about having you do that much for me.
酷いひどい
こと
なる
想像そーぞー
難くかたく
ない
It's not hard to imagine that things will turn out badly.
そんな
ふー
思っおもっ
いる
おれ
だけ
じゃ
ない
はず
I'm sure I'm not the only one thinking that way.